I've had one for years and discovered something while I was on a low
roof one day. I could see the top of my van and it was quite dirty.
I had some coil cleaner mix left in the the sprayer and foamed the
van's roof then rinsed it off with the detachable hose nozzle and
the van roof sparkled like new.
TDD

Works on greasy car engines, too, I'd expect. I've had a couple
moments when I was working on the car, and it was a bit too dirty.
Condensors for car AC also need cleaning.
I hope no one was standing near your van, and got splashed with coil
cleaner. Of course not...... you're too safety minded.

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